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An opinion poll randomly surveyed 1,700 people. The polling organization found the percentage of the sample...

An opinion poll randomly surveyed 1,700 people. The polling organization found the percentage of the sample that said the country is going in a positive direction. The margin of error of the confidence interval based on these results is ______ percentage points. Round your answer to the nearest tenth of a percentage point.

Based on an opinion poll, a polling organization reported that they are 95% confident that between 48.9% and 55.3% of all adult Americans feel the country is going in the wrong direction. The margin of error of this poll is _______ percentage points.

IQ scores are approximately normally distributed with a mean of 100 and a standard deviation of 15. Use the 68-95-99.7 Rule to answer the following question. What percent of people have IQs between 70 and 115?

Math   Statistics-And-Probability   
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hii.. although I am trying to provide the detailed answer but if you have any doubt please ask by comment...

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